That's literally what I just said. I said that this was a key difference between players of different levels. That's the same thing as imbalance in competiton. Anyway, the point is that the OP is probably a very good player and he's playing a much better player. That's why the ball was landing short. If the D1 player from the video played any of the ATP top 100, he would be the one hitting short. I was in no way trying to put anybody down.
No, not literally.
I don't think you were putting folks down, but here you again miss
the subtle but important point, I'm trying to get across.
In this case, hitting shorter is a symtom, not a " key difference between players of different levels".
It is more of a "relative difference" generally than a key difference.
If it was a key difference, the weaker players will hit shorter and the stronger players on the USTA scale would hit longer, but if you watch 2 even 7.0 players in a match, they will not hit so deep as many would expect.
And two very even 4.0s would not hit correspondingly short in relation.
So shot depth of a player will tell us little except about how he was coached.
My son in the Jrs will often hit shorter than his opponent in the matches he is winning due to his training, even though he may be winning 6-1 or so.
Often his opponents are taught how great hitting deep near the baseline is and will try to play this way, because as you seem to, they think this is what better players do.
My point is that hitting very deep is something better players can get away with against weaker players, but really no other time,
unless against another misinformed player (which is very common too). It is not the great attribute it has been touted as.
When matches are tough (aren't these the ones that matter?) or close, players use a mixture of depth and often avoid going very deep due to the risks. If that is best for tough matches, don't you think it would be smart to make that the habit so you are ready more for tough matches?